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= PITX1 =

paired-like homeodomain 1 is a protein that in humans is encoded by the PITX1 gene.

Function
This gene encodes a member of the RIEG/PITX homeobox family, which is in the bicoid class of homeodomain protein transcription factors. Members of this family are involved in organ development, left-right asymmetry and hindlimb development. This protein acts as a transcriptional regulator involved in basal and hormone-regulated activity of prolactin. PITX1 is associated with hindlimb development and when inactivated hindlimb development is severely hindered.

Clinical relevance
Mutations in this gene have been associated with autism, club foot and polydactyly in humans.

Genetic Basis of Pathologies
Genomic rearrangements at the PITX1 locus are associated with Liebenberg syndrome. In PITX1 Liebenberg is associated with a translocation or deletions, which cause insert promoter groups into the PITX1 locus. A missense mutation within the PITX1 locus is associated with the development of autosomal dominant clubfoot.

Interactions
PITX1 has been shown to interact with Pituitary-specific positive transcription factor 1.